Multihigh rolling mechanism



April 11, 1933. w, RQHN 1,903,724

MULTIHIGH ROLLING MECHANISM Filed July 15, 1931 Fig. 2 [221/1922 Z02":

afzzwp .UITED. STATE some, or mamasmam, e a:

- ROLLING HECEANIQH Application filed fully 18, 1981, Serial No.

This invention relates to improvements in and relating to multi-high rolling 'mechanisms.

For the purpose of rolling strips, bands and sheets only twin roll. mechanisms were used originall Later on the operating rolls were made t inner and weremounted between su porting rolls so as to transfer the forces w ich were taken u by the rolling mechanism during the rolling operation to the thicker supporting rolls. This superposition of the rolls led to the construction of the known four and six high rolling mechanisms.

There are certain limitations of the sixhigh mills which become particularly important as I reduce the diameter of the operating rolls. The present invention aims to provide rolling mec anism by which such disadvanta es are obviated. 4

he accompan ing drawing illustrates an embodiment of t e invention;

Fig. 1 is a diagrammatic end view; Fig. 2 is a. vertical sectional view showing the two operating rolls and their driving mechanism;

Figs. 3 and 4 are respectively sectional views of details.

Referi'ing to the embodiment of the invention illustrated, a pair of o crating rolls A, A are backed or supporte by prnnary supporting rolls B, B for the operating rolls A and C, C" for the'operating roll A. The primary supporting rollsare in turn su ported b secondary supporting rolls E, 1% and E" or the rolls B and B, and F, F and F for the rolls (3 and G.

This construction is particularl useful where the operating rolls have to he made very small. It is a condition of such apparatus that the plane D, which is tangent to the supporting rolls B and B must ass through the corresponding operating ro A so that the latter may project beyond such plane in order to engage the work. The fact that there aretwo supporting rolls B and B for the one operating roll puts a limit on the size of these two supporting rolls. They cannot be made large enough to touch each other above'the operating roll; nor placed. high and to provide a supplementary set of sup- 550528, and in Germany July 29, 1980.

enough to make such contact with each other. Furthermore, if we assume a constant diameter and fixed position of the su porting rolls, an reduction in diameter of t e oper- 'atmg ro ls moves the latter farther into the bight of the supporting rolls and brings the pressure of the latter more and more toward the horizontal direction which is least effective in resisting the vertical strains of use.

Thus the supporting rolls (where two sup-I porting rolls are used for each operating roll) are limited in maximum diameter, first, by the need to keep them well away from contact with the work passing through the operating rolls, and second, by the requirementthat they bear on the operating roll in a direction having a substantial vertical component.

Ordinarily rolls like B and B would be about twice or two and a half times the diameter of their operating roll A. If the operating rolls A and A were made very small, for example, with a diameter of only thirty to fifty millimeters, the supporting rolls would have to be of correspondingly small diameters; and for mechanism re uiring very high pressures would not be capa le of withstand ing the strains of the rolling operation.

' In order to make a rolling mill with a very small operating roll, and at the same time to secure a hi h ressure, I propose to use rolls B, B and 5, 5 as primary supporting rolls, to make these comparatively. small so as to avoid the disadvantages referred I to above,

porting rolls E, E, E and F, F, F supporting the reaction of the primary rolls.

' Various arrangements and sizes of this su plementary set of supporting rolls may e provided. I propose to make them as illustrated, about twice or two and a half times the diameter of the primary supporting rolls,

with E and E bearing on the outsides of the separate rolls B and B and with the central roll E bearing against both the rolls B and B and located in line above the operating roll A; and similarly for the lower supporting rolls.

The operating rolls of such a rolling mechanism are preferably not provided with pivfor hot rolling, the

-without pivots.

ots and are in the form of solid cylinders or as hollow cylinders of which the inner surface has not been carefully machined. hollow cylinders are used, it is only necessary to simply fit these on the driving) shafts and to connect them thereto by a suita le cou ling device. When it is desired to roll wiiih an extremely small diameter it is no longer possible to use hollow rolls. The drive of the o crating rolls is then preferably efiected in t e manner illustrated in Figure 2. In Figure 3 A, A again indicate the operating rolls. At one end these are connected b a coupling device G, G to the shafts J an J respectively. The drive is effected by means of toothed wheel gearing from a common shaft K, in which case one of the operatin rolls is driven through intermediate gear so that this roll is rotated in the ogposite direction to the other. The coupling evices are preferably provided at different ends of the two operating rolls. The rolls may then he formed of simple smooth cylinders and the engagement may be effected by a bolt or pin passed through a transverse hole.

Particularly in connection with the intermediate rolls B, B and C, C it is advisable in some circumstances not to provide these in the usual manner with shafts rigidly connected to the roll body. It is generally preferable to fit the rolling cylinders in the mannor of a roller bearing on a rigid non-rotating shaft. A diagrammatic illustration of such rollers is illustrated in Figure 3, in which M indicates the fixed shaft, 13 the roller and O the bearings of this roller on the shaft. In other cases it may be preferable to form the supporting rolls or both the supporting rolls and the intermediate rolls in this manner. Finally, the intermediate rolls may consist of simple cylinders The intermediate rolls are preferably pressed by a spring mounting N against the outer supporting rolls.

in man cases, namely when rolling hot material, it is advisable to cool the various,

rollers.

Tn the case of the operating rolls, is preferably efiected from the ich is not connected to the drivcooling pipes for example into a bore of te rolls, a cooling medium eing passed through these pipes. In the case of the interme iate rolls similar pi es may he fitted into the shaft, which is pre erably stationary. The pipes may extend along the whole length of t e shait and are intro this coolin free end, w ing shaft, by fittin duced from one end, or when rolls with pivots are used short sections of pipes may be fitted from both ends into the pivots, as

shown in Fig. 4 wherein the coolin pipes are indicated by P. If a rolling mec amsm according to the present invention is to be used pivots of the intermediate rollls dand supporting rolls are preferably coo e When- When using a rolling mechanism according to the present invention it is possible in an economical manner to use operating rolls of materials which have proved uneconomical in the previously usual rolling mechanism requiring large operatin rolls. For example operating rolls in a to ling mechanism according to the present invention may be com structed metal of the so-called hartmetall (hard metal) type which generally comprise alloys containing hard constituents such as tungsten carbide, tantalum carbide, molybdenum carbide and also may contain such metals as tungsten, molybdenum, tantalum gilth possible additions of iron, nickel or co- The costs of such small rolls are naturally low and in addition there is less waste when hardening the rolls. As further by the small rolls a higher s ecific pressure and thus a greater rolling e ect is accomplished, the cost of operation of the rolling mechanism is also cheaper than that of the previously known rolling mechanisms.

As the drawing-in action of smaller rollers for the material is only slight, it is necessary in man cases, when using very small operating rol to oint or reduce in size the head of the material to be rolled before introducing it into the operatin rolls.

Any usual or suitab e method and apparatus may be used for this purpose.

The location of the supportmg rolls is advantageous in securing the proper direction and balance of pressures and in attaining compactness of the com lete stand of rolls.

The rolls B and B ear on the roll A at points beyond its center so that the pressure has a substantial vertical component. The rolls E and E bear on the rolls B and B at about the same angle. That is to say, the centers of A, B and E are approximatelv in a straight line and also the centers of A, B and E". The reaction from the outer roll, therefore, is transmitted practically straight throu h the-intermediate roll to the operating roll. he central roll E extends very little above the two side rolls E and E. It engagm both the rolls B and B so as to maintain their spacing and location, the roll E being in vertical alignment-with the operat in% roll A.

has in a very corn of the backing-up rolls efiiciently to the operating rolls. conditions exist for the lower o eratin A and its supporting rolls 0, and and F The principle tinned further high rolling mechanisms to twenty high rollin mechanisms and so on.

e principle is not limited to the drive of the operating rolls. As all the rolls have the same peripheral speed, the operating rolls behere described may be conand incorporated in twelve ing the smallest have the highest number of revolutions. If the operating rolls are driven there is the lowest ratio of transmission between the motor and the rolls. In many cases the motor may be connected directly to one of the rolls, or each of the operating rolls may be connected directly to a motor in the known manner. According to the particular conditions the drive may be also connected to the intermediate rolls or to the supporting rolls.

I claim 1. A rolling mechanism comprising a pair of operating rolls adapted to engage the opposite faces of the Work, a pluralit of primary supporting rolls hearing against each of said operating rolls and located at o posite sides thereof, beyond the plane 0 the work and tangent to the operatin roll at points beyond the center lines of t e latter, and a plurality of secondary supportingrolls bearing against the primary supporting rolls.

2. A rolling mechanism comprising a pair of operating rolls adapted to enga the opposite faces of the work, a plura ity of primary supporting rolls bearing against each of said operating rolls and located at o posite sides thereof, beyond the plane of A t e work and tangent to the operating roll at points he end the center lines of the latter, an a plura ity of secondary supporting rolls bearing against the primary supporting rolls, the ratio of the diameters of the primary supporting rolls to those of the oper-' ating rolls not exceeding 5 to 2.

3. A-rolling mechanism comprising a pair of operating rolls adapted to engage the op-- work andtangent to the operatin points beyond-the center lines of drive shaft and being held in position posite facesof the work, a plurality of pri mary supporting rolls bearing against each of said operating rolls ,and located at, opposite, sides thereof, beyond the plane of the roll at e latter, and a plurality of secondary supporting rolls bearing against the primary su porting rolls, the ratio of the diameters of the primary supporting rolls to those of the operating rolls as well as the ratio of the diameters of the secondary supporting. rolls to those of the p2rimary supportingrolls not exceeding to 4. The rolling mechanism of claim 1, the operating rolls being coupled directl to a primary supporting rolls bearing against.

I 5. The rolli means for driving the 'operat' rolls consisting of shafts at opposite sides of the there- 'porting rolls to those of the mechanism of claim 1 and said rolls and antifriction bearinglhetween.

said shafts and their respective r0 7. The rollin mechanism of claim 1, the

bein small rolls comprised operating rolls g 0 metal of the so-cal ed hartmetall type.

8. The rollin mechanism of claim 1, the operating rolls in der of 30 to 50 mi limeters diameter, the ratio of the diameters of the primary su operating ro not exceedin 5. to 2.

' 9. The rol in mechanism of claim 1, the

very small of the or-' 11. Therolling mechanismof claim 1,'the

o crating rolls being verysmall of the order 0? 30 to 50 millimeters, the ratio of the diameters of the primary su porting rolls .to those of the operating ro is and also the ratio of the diameters of the secondary supporting rolls to those of the primer supporting rolls. notexceeding 5 to 2, t e secondary supportingrolls bemg three in number, a central one located in vertical alignment with the operating roll and bearing on both the primary supporting rolls and two outside ro ing rolls in such locations as to brin their centers in substantial alignment with e cenand the operating ro In testimony whereof I afix my signature.

WILHELM ROHN.

ythe

mechanism each one coupled to an end of I I one of the operating rolls.

6. The rolling mechanism of claim 1, the supporting rolls bein tion with stationary afts passing through hollow in combinais hearing on the primary supportter of the contacting firimary supporting roll 

